Manufacture of eye-bars



(No Model.)

H. C. STAAR.

MANUFACTURE OF EYE BARS.

No. 337,881. Patented Mar. 16, 1886.

Wm. WWW D. 12.

UNITE STATES PATENT OFFICE.

HENRY O. STAAR, OF PITTSBURG, PENNSYLVANIA.

MANUFACTURE CF EYE-BARS.

SPECIFICATION forming part of Letters Patent No. 337,881, dated March 16, 1886.

Application filed March 13, 1885.

To all whom it may concern:

Be it known that I, HENRY O. STAAR, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in the Mannfacture of Eye-Bars used in the Construction of Bridges; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

My invention relates to an improvement in the manufacture of eye-bars used in the construction of bridges, the object being to prevent what is known to the art as blistering.

It is well known that when the several parts used in the construction of eye-bars are brought to a high degree of heat and welded together the cinder, scale, and various other substances adhere to the metal and form a gas, which prevents a solid weld at the center of the plates. To obviate this I cause the top and bottom plates to be perforated with one or more openings, which permit the escape of the gases and allow the several parts to be firmly and securely welded.

In the accompanying drawings, Figure 1 is a plan View of an unfinished eyebar. At one end I show an ordinary loop, at the other my improved perforated plate over the loop, ready to be welded. Fig. 2 is a plan view of loop, such as is commonly used. Fig. 3 is a plan View of a perforated plate. Fig. 4 is a plan view of my improved elongated octagonalshaped plate, with perforations to allow the escape of the gas. Fig. 5 is a perspective view of one end of an eye-bar, the several parts placed in position for welding. Fig. 6

is a perspective view of one end of a finished eye-bar.

To put my invention into practice, I provide a metal bar, A, over one end of which I place Serial No. 158,939. (No model.)

a loop, 13, of ordinary construction, and of the same thickness as the bar A. Under and over this I place octagonal-shaped plates 0, perforated with one or more openings, (1 b, and bring the whole to a proper degree of heat. The openings at b in the plates 0 will allow the gas which accumulates between the several parts to escape, and said parts can be readily welded. I repeat this operation at the other end of the bar, and shape the eyes to the form shown at Fig. 6 on the drawings. use an elongated octagonalshaped plate, D, which, when placed over the loop B, thelongest sides 0 (1 will be at right angles to the bar A, which allows the eye of bar to be worked more on the edges, and to better advantage than by the present method.

Heretofore eye-bars have been constructed by providing the end of the bar with a loop, then placing solid plates above and below the loop, welding the whole together, and then forming the bolt-hole; but my invention differs from that method in that I form small perforations in the plates before they are applied to the loop, in order that the gas generated between the plates and loop in welding may be permitted to escape, and thus avoid blistering. The bolt-hole is formed after welding, in the usual manner.

Having thus described my invention, what I claim, and desire to secure by Letters Patcut, is-

The herein-described improvement in the art of making eye-bars, which consists in providing each end of the bar with a loop of a thickness equal to that of the bar, then placing a perforated plate both above and below said loop, then heating the whole to a proper degree and welding, and finally shaping the eye as desired.

HENRY O. STAAR. l/Vitnesses:

M. E. HARRISON, W. O. BARR.

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